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为研究高强度钢材Q460C焊缝连接在地震作用下的反应,对11个Q460C焊缝连接试件进行了8种不同加载制度的单调和循环加载试验,分析比较了不同加载制度下的应力-应变关系,研究其本构模型、力学性能、破坏模式、变形和延性特征以及损伤退化特性,并和母材的性能进行了对比。利用Ramberg-Osgood公式对其循环骨架曲线进行了拟合,确定了拟合计算式中的待定参数;通过试验标定了循环荷载作用下本构模型的参数,采用有限元程序ABAQUS利用混合模型对上述循环加载试验进行了较为准确的有限元模拟。研究结果表明:所有加载制度下试件最终均在焊缝和热影响区交界面拉断,这和焊缝连接处的应力集中有关;与母材单调拉伸性质相比,焊缝连接试件延性下降显著,说明焊接过程对钢材有严重影响,应采取措施避免破坏发生在焊缝区域。
In order to study the response of Q460C weld of high-strength steel under the action of earthquake, monotonic and cyclic loading tests of 8 different loading systems were carried out on 11 Q460C welded joints, and the stress-strain Relationship, study of its constitutive model, mechanical properties, failure modes, deformation and ductility characteristics and damage degradation characteristics, and the performance of the parent material were compared. The cyclic skeleton curve was fitted by Ramberg-Osgood formula, and the parameters to be determined in the fitting formula were determined. The parameters of the constitutive model under cyclic loading were calibrated by using the method of finite element program ABAQUS. Cyclic loading test carried out a more accurate finite element simulation. The results show that the specimens are all pulled off at the interface between the weld and the HAZ under all loading conditions, which is related to the stress concentration at the weld joint. Compared with the monotonous tensile properties of the base material, Ductility decreased significantly, indicating that the welding process has a serious impact on the steel, should take measures to avoid damage occurred in the weld area.